A body of mass 0.4, kg is whirled in a vertical circle making 2, rev/sec . If radius of circle is 2,

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5.Work, Energy, Power and Collision

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A body of mass $0.4\, kg$ is whirled in a vertical circle making $2\, rev/sec$. If the radius of the circle is $2\, m$, then tension in the string when the body is at the top of the circle, is ......... $N$

A

$41.56 $

B

$89.86 $

C

$109.86$

D

$115.86$

Solution

(d) Tension at the top of the circle,$T = m{\omega ^2}r – mg$

$T = 0.4 \times 4{\pi ^2}{n^2} \times 2 – 0.4 \times 9.8 = 115.86\,N$

Standard 11

Physics

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